Energy Storage
A capacitor can store electric energy when disconnected from its charging circuit, so it can be used like a temporary battery. Capacitors are commonly used in electronic devices to maintain power supply while batteries are being changed. (This prevents loss of information in volatile memory.)
Conventional electrostatic capacitors provide less than 360 joules per kilogram of energy density, while capacitors using developing technology can provide more than 2.52 kilojoules per kilogram.
In car audio systems, large capacitors store energy for the amplifier to use on demand.
An uninterruptible power supply (UPS) can be equipped with maintenance-free capacitors to extend service life.
Read more about this topic: Applications Of Capacitors
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